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AnswerRe: OPOS Posprinter : Displays Incorrect Alignment Pin
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QuestionGet hard disk serial number in RAID controllers Pin
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Questionproblem appear monitor Pin
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Sebastian Schneider25-Jun-08 23:17
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QuestionIdentifying USB ports Pin
NetDave24-Jun-08 13:45
NetDave24-Jun-08 13:45 
AnswerRe: Identifying USB ports Pin
Mike Dimmick25-Jun-08 1:20
Mike Dimmick25-Jun-08 1:20 
It's a bit of a dirty approach, but here goes:

In USB 1.x, the programming interface from the PC to the USB controller wasn't standardised. Intel came up with one solution they called 'Universal Host Controller Interface' (UHCI) but there's a second solution defined by Compaq, Microsoft and National Semiconductor called 'Open Host Controller Interface', OHCI. I think this was partly a technology issue - OHCI reportedly requires less software and generally lower CPU usage - but also a licensing one.

For USB 2.0, the software people put their collective feet down and insisted on a common controller interface, which is called Enhanced Host Controller (EHCI). In Device Manager, you'll typically see USB 2.0 controllers listed as USB2 Enhanced Host Controller.

You can always find how a device is connecting to the system by selecting View, Devices by Connection from the menu. By expanding the tree, you can see whether a USB Hi-Speed device (connected to each port in turn) is connected to an EHCI or to a UCHI or OHCI controller.

This is further complicated because physical ports can be 'connected' to both an EHC and a UHC/OHC. The system works out whether the device is requesting Hi-Speed (480Mbps) and if so, 'connects' it logically to the EHC. If not, it connects it logically to the UHC or OHC. That's why I suggest using a Hi-Speed device. Most modern integrated USB controllers actually do both in one chip or subsystem of the chip and the UHC or OHC presented to the OS is generally referred to as a virtual device.


DoEvents: Generating unexpected recursion since 1991

GeneralRe: Identifying USB ports Pin
NetDave25-Jun-08 7:36
NetDave25-Jun-08 7:36 
GeneralRe: Identifying USB ports Pin
zafersavas9-Jul-08 6:22
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AnswerRe: Identifying USB ports Pin
fat_boy25-Jun-08 1:50
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GeneralRe: Identifying USB ports Pin
NetDave25-Jun-08 7:36
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GeneralRe: Identifying USB ports Pin
Vaclav_18-Jul-08 5:06
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QuestionPortable Storage Device Problem - SOLVED Pin
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AnswerRe: Portable Storage Device Problem - SOLVED Pin
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Question5.25" floppy drive support? Pin
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AnswerRe: 5.25" floppy drive support? Pin
Mike Dimmick25-Jun-08 2:57
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AnswerRe: 5.25" floppy drive support? Pin
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